src/wps/wps.c

   1 /*
   2  * Wi-Fi Protected Setup
   3  * Copyright (c) 2007-2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/dh_group5.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "wps_i.h"
  15 #include "wps_dev_attr.h"
  16
  17
  18 #ifdef CONFIG_WPS_TESTING
  19 int wps_version_number = 0x20;
  20 int wps_testing_dummy_cred = 0;
  21 #endif /* CONFIG_WPS_TESTING */
  22
  23
  24 /**
  25  * wps_init - Initialize WPS Registration protocol data
  26  * @cfg: WPS configuration
  27  * Returns: Pointer to allocated data or %NULL on failure
  28  *
  29  * This function is used to initialize WPS data for a registration protocol
  30  * instance (i.e., each run of registration protocol as a Registrar of
  31  * Enrollee. The caller is responsible for freeing this data after the
  32  * registration run has been completed by calling wps_deinit().
  33  */
  34 struct wps_data * wps_init(const struct wps_config *cfg)
  35 {
  36         struct wps_data *data = os_zalloc(sizeof(*data));
  37         if (data == NULL)
  38                 return NULL;
  39         data->wps = cfg->wps;
  40         data->registrar = cfg->registrar;
  41         if (cfg->registrar) {
  42                 os_memcpy(data->uuid_r, cfg->wps->uuid, WPS_UUID_LEN);
  43         } else {
  44                 os_memcpy(data->mac_addr_e, cfg->wps->dev.mac_addr, ETH_ALEN);
  45                 os_memcpy(data->uuid_e, cfg->wps->uuid, WPS_UUID_LEN);
  46         }
  47         if (cfg->pin) {
  48                 data->dev_pw_id = data->wps->oob_dev_pw_id == 0 ?
  49                         cfg->dev_pw_id : data->wps->oob_dev_pw_id;
  50                 data->dev_password = os_malloc(cfg->pin_len);
  51                 if (data->dev_password == NULL) {
  52                         os_free(data);
  53                         return NULL;
  54                 }
  55                 os_memcpy(data->dev_password, cfg->pin, cfg->pin_len);
  56                 data->dev_password_len = cfg->pin_len;
  57         }
  58
  59 #ifdef CONFIG_WPS_NFC
  60         if (cfg->wps->ap && !cfg->registrar && cfg->wps->ap_nfc_dev_pw_id) {
  61                 data->dev_pw_id = cfg->wps->ap_nfc_dev_pw_id;
  62                 os_free(data->dev_password);
  63                 data->dev_password =
  64                         os_malloc(wpabuf_len(cfg->wps->ap_nfc_dev_pw));
  65                 if (data->dev_password == NULL) {
  66                         os_free(data);
  67                         return NULL;
  68                 }
  69                 os_memcpy(data->dev_password,
  70                           wpabuf_head(cfg->wps->ap_nfc_dev_pw),
  71                           wpabuf_len(cfg->wps->ap_nfc_dev_pw));
  72                 data->dev_password_len = wpabuf_len(cfg->wps->ap_nfc_dev_pw);
  73         }
  74 #endif /* CONFIG_WPS_NFC */
  75
  76         data->pbc = cfg->pbc;
  77         if (cfg->pbc) {
  78                 /* Use special PIN '00000000' for PBC */
  79                 data->dev_pw_id = DEV_PW_PUSHBUTTON;
  80                 os_free(data->dev_password);
  81                 data->dev_password = (u8 *) os_strdup("00000000");
  82                 if (data->dev_password == NULL) {
  83                         os_free(data);
  84                         return NULL;
  85                 }
  86                 data->dev_password_len = 8;
  87         }
  88
  89         data->state = data->registrar ? RECV_M1 : SEND_M1;
  90
  91         if (cfg->assoc_wps_ie) {
  92                 struct wps_parse_attr attr;
  93                 wpa_hexdump_buf(MSG_DEBUG, "WPS: WPS IE from (Re)AssocReq",
  94                                 cfg->assoc_wps_ie);
  95                 if (wps_parse_msg(cfg->assoc_wps_ie, &attr) < 0) {
  96                         wpa_printf(MSG_DEBUG, "WPS: Failed to parse WPS IE "
  97                                    "from (Re)AssocReq");
  98                 } else if (attr.request_type == NULL) {
  99                         wpa_printf(MSG_DEBUG, "WPS: No Request Type attribute "
 100                                    "in (Re)AssocReq WPS IE");
 101                 } else {
 102                         wpa_printf(MSG_DEBUG, "WPS: Request Type (from WPS IE "
 103                                    "in (Re)AssocReq WPS IE): %d",
 104                                    *attr.request_type);
 105                         data->request_type = *attr.request_type;
 106                 }
 107         }
 108
 109         if (cfg->new_ap_settings) {
 110                 data->new_ap_settings =
 111                         os_malloc(sizeof(*data->new_ap_settings));
 112                 if (data->new_ap_settings == NULL) {
 113                         os_free(data->dev_password);
 114                         os_free(data);
 115                         return NULL;
 116                 }
 117                 os_memcpy(data->new_ap_settings, cfg->new_ap_settings,
 118                           sizeof(*data->new_ap_settings));
 119         }
 120
 121         if (cfg->peer_addr)
 122                 os_memcpy(data->peer_dev.mac_addr, cfg->peer_addr, ETH_ALEN);
 123         if (cfg->p2p_dev_addr)
 124                 os_memcpy(data->p2p_dev_addr, cfg->p2p_dev_addr, ETH_ALEN);
 125
 126         data->use_psk_key = cfg->use_psk_key;
 127         data->pbc_in_m1 = cfg->pbc_in_m1;
 128
 129         return data;
 130 }
 131
 132
 133 /**
 134  * wps_deinit - Deinitialize WPS Registration protocol data
 135  * @data: WPS Registration protocol data from wps_init()
 136  */
 137 void wps_deinit(struct wps_data *data)
 138 {
 139 #ifdef CONFIG_WPS_NFC
 140         if (data->registrar && data->nfc_pw_token)
 141                 wps_registrar_remove_nfc_pw_token(data->wps->registrar,
 142                                                   data->nfc_pw_token);
 143 #endif /* CONFIG_WPS_NFC */
 144
 145         if (data->wps_pin_revealed) {
 146                 wpa_printf(MSG_DEBUG, "WPS: Full PIN information revealed and "
 147                            "negotiation failed");
 148                 if (data->registrar)
 149                         wps_registrar_invalidate_pin(data->wps->registrar,
 150                                                      data->uuid_e);
 151         } else if (data->registrar)
 152                 wps_registrar_unlock_pin(data->wps->registrar, data->uuid_e);
 153
 154         wpabuf_free(data->dh_privkey);
 155         wpabuf_free(data->dh_pubkey_e);
 156         wpabuf_free(data->dh_pubkey_r);
 157         wpabuf_free(data->last_msg);
 158         os_free(data->dev_password);
 159         os_free(data->new_psk);
 160         wps_device_data_free(&data->peer_dev);
 161         os_free(data->new_ap_settings);
 162         dh5_free(data->dh_ctx);
 163         os_free(data->nfc_pw_token);
 164         os_free(data);
 165 }
 166
 167
 168 /**
 169  * wps_process_msg - Process a WPS message
 170  * @wps: WPS Registration protocol data from wps_init()
 171  * @op_code: Message OP Code
 172  * @msg: Message data
 173  * Returns: Processing result
 174  *
 175  * This function is used to process WPS messages with OP Codes WSC_ACK,
 176  * WSC_NACK, WSC_MSG, and WSC_Done. The caller (e.g., EAP server/peer) is
 177  * responsible for reassembling the messages before calling this function.
 178  * Response to this message is built by calling wps_get_msg().
 179  */
 180 enum wps_process_res wps_process_msg(struct wps_data *wps,
 181                                      enum wsc_op_code op_code,
 182                                      const struct wpabuf *msg)
 183 {
 184         if (wps->registrar)
 185                 return wps_registrar_process_msg(wps, op_code, msg);
 186         else
 187                 return wps_enrollee_process_msg(wps, op_code, msg);
 188 }
 189
 190
 191 /**
 192  * wps_get_msg - Build a WPS message
 193  * @wps: WPS Registration protocol data from wps_init()
 194  * @op_code: Buffer for returning message OP Code
 195  * Returns: The generated WPS message or %NULL on failure
 196  *
 197  * This function is used to build a response to a message processed by calling
 198  * wps_process_msg(). The caller is responsible for freeing the buffer.
 199  */
 200 struct wpabuf * wps_get_msg(struct wps_data *wps, enum wsc_op_code *op_code)
 201 {
 202         if (wps->registrar)
 203                 return wps_registrar_get_msg(wps, op_code);
 204         else
 205                 return wps_enrollee_get_msg(wps, op_code);
 206 }
 207
 208
 209 /**
 210  * wps_is_selected_pbc_registrar - Check whether WPS IE indicates active PBC
 211  * @msg: WPS IE contents from Beacon or Probe Response frame
 212  * Returns: 1 if PBC Registrar is active, 0 if not
 213  */
 214 int wps_is_selected_pbc_registrar(const struct wpabuf *msg)
 215 {
 216         struct wps_parse_attr attr;
 217
 218         /*
 219          * In theory, this could also verify that attr.sel_reg_config_methods
 220          * includes WPS_CONFIG_PUSHBUTTON, but some deployed AP implementations
 221          * do not set Selected Registrar Config Methods attribute properly, so
 222          * it is safer to just use Device Password ID here.
 223          */
 224
 225         if (wps_parse_msg(msg, &attr) < 0 ||
 226             !attr.selected_registrar || *attr.selected_registrar == 0 ||
 227             !attr.dev_password_id ||
 228             WPA_GET_BE16(attr.dev_password_id) != DEV_PW_PUSHBUTTON)
 229                 return 0;
 230
 231 #ifdef CONFIG_WPS_STRICT
 232         if (!attr.sel_reg_config_methods ||
 233             !(WPA_GET_BE16(attr.sel_reg_config_methods) &
 234               WPS_CONFIG_PUSHBUTTON))
 235                 return 0;
 236 #endif /* CONFIG_WPS_STRICT */
 237
 238         return 1;
 239 }
 240
 241
 242 static int is_selected_pin_registrar(struct wps_parse_attr *attr)
 243 {
 244         /*
 245          * In theory, this could also verify that attr.sel_reg_config_methods
 246          * includes WPS_CONFIG_LABEL, WPS_CONFIG_DISPLAY, or WPS_CONFIG_KEYPAD,
 247          * but some deployed AP implementations do not set Selected Registrar
 248          * Config Methods attribute properly, so it is safer to just use
 249          * Device Password ID here.
 250          */
 251
 252         if (!attr->selected_registrar || *attr->selected_registrar == 0)
 253                 return 0;
 254
 255         if (attr->dev_password_id != NULL &&
 256             WPA_GET_BE16(attr->dev_password_id) == DEV_PW_PUSHBUTTON)
 257                 return 0;
 258
 259 #ifdef CONFIG_WPS_STRICT
 260         if (!attr->sel_reg_config_methods ||
 261             !(WPA_GET_BE16(attr->sel_reg_config_methods) &
 262               (WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD)))
 263                 return 0;
 264 #endif /* CONFIG_WPS_STRICT */
 265
 266         return 1;
 267 }
 268
 269
 270 /**
 271  * wps_is_selected_pin_registrar - Check whether WPS IE indicates active PIN
 272  * @msg: WPS IE contents from Beacon or Probe Response frame
 273  * Returns: 1 if PIN Registrar is active, 0 if not
 274  */
 275 int wps_is_selected_pin_registrar(const struct wpabuf *msg)
 276 {
 277         struct wps_parse_attr attr;
 278
 279         if (wps_parse_msg(msg, &attr) < 0)
 280                 return 0;
 281
 282         return is_selected_pin_registrar(&attr);
 283 }
 284
 285
 286 /**
 287  * wps_is_addr_authorized - Check whether WPS IE authorizes MAC address
 288  * @msg: WPS IE contents from Beacon or Probe Response frame
 289  * @addr: MAC address to search for
 290  * @ver1_compat: Whether to use version 1 compatibility mode
 291  * Returns: 2 if the specified address is explicit authorized, 1 if address is
 292  * authorized (broadcast), 0 if not
 293  */
 294 int wps_is_addr_authorized(const struct wpabuf *msg, const u8 *addr,
 295                            int ver1_compat)
 296 {
 297         struct wps_parse_attr attr;
 298         unsigned int i;
 299         const u8 *pos;
 300         const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 301
 302         if (wps_parse_msg(msg, &attr) < 0)
 303                 return 0;
 304
 305         if (!attr.version2 && ver1_compat) {
 306                 /*
 307                  * Version 1.0 AP - AuthorizedMACs not used, so revert back to
 308                  * old mechanism of using SelectedRegistrar.
 309                  */
 310                 return is_selected_pin_registrar(&attr);
 311         }
 312
 313         if (!attr.authorized_macs)
 314                 return 0;
 315
 316         pos = attr.authorized_macs;
 317         for (i = 0; i < attr.authorized_macs_len / ETH_ALEN; i++) {
 318                 if (os_memcmp(pos, addr, ETH_ALEN) == 0)
 319                         return 2;
 320                 if (os_memcmp(pos, bcast, ETH_ALEN) == 0)
 321                         return 1;
 322                 pos += ETH_ALEN;
 323         }
 324
 325         return 0;
 326 }
 327
 328
 329 /**
 330  * wps_ap_priority_compar - Prioritize WPS IE from two APs
 331  * @wps_a: WPS IE contents from Beacon or Probe Response frame
 332  * @wps_b: WPS IE contents from Beacon or Probe Response frame
 333  * Returns: 1 if wps_b is considered more likely selection for WPS
 334  * provisioning, -1 if wps_a is considered more like, or 0 if no preference
 335  */
 336 int wps_ap_priority_compar(const struct wpabuf *wps_a,
 337                            const struct wpabuf *wps_b)
 338 {
 339         struct wps_parse_attr attr_a, attr_b;
 340         int sel_a, sel_b;
 341
 342         if (wps_a == NULL || wps_parse_msg(wps_a, &attr_a) < 0)
 343                 return 1;
 344         if (wps_b == NULL || wps_parse_msg(wps_b, &attr_b) < 0)
 345                 return -1;
 346
 347         sel_a = attr_a.selected_registrar && *attr_a.selected_registrar != 0;
 348         sel_b = attr_b.selected_registrar && *attr_b.selected_registrar != 0;
 349
 350         if (sel_a && !sel_b)
 351                 return -1;
 352         if (!sel_a && sel_b)
 353                 return 1;
 354
 355         return 0;
 356 }
 357
 358
 359 /**
 360  * wps_get_uuid_e - Get UUID-E from WPS IE
 361  * @msg: WPS IE contents from Beacon or Probe Response frame
 362  * Returns: Pointer to UUID-E or %NULL if not included
 363  *
 364  * The returned pointer is to the msg contents and it remains valid only as
 365  * long as the msg buffer is valid.
 366  */
 367 const u8 * wps_get_uuid_e(const struct wpabuf *msg)
 368 {
 369         struct wps_parse_attr attr;
 370
 371         if (wps_parse_msg(msg, &attr) < 0)
 372                 return NULL;
 373         return attr.uuid_e;
 374 }
 375
 376
 377 /**
 378  * wps_is_20 - Check whether WPS attributes claim support for WPS 2.0
 379  */
 380 int wps_is_20(const struct wpabuf *msg)
 381 {
 382         struct wps_parse_attr attr;
 383
 384         if (msg == NULL || wps_parse_msg(msg, &attr) < 0)
 385                 return 0;
 386         return attr.version2 != NULL;
 387 }
 388
 389
 390 /**
 391  * wps_build_assoc_req_ie - Build WPS IE for (Re)Association Request
 392  * @req_type: Value for Request Type attribute
 393  * Returns: WPS IE or %NULL on failure
 394  *
 395  * The caller is responsible for freeing the buffer.
 396  */
 397 struct wpabuf * wps_build_assoc_req_ie(enum wps_request_type req_type)
 398 {
 399         struct wpabuf *ie;
 400         u8 *len;
 401
 402         wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
 403                    "Request");
 404         ie = wpabuf_alloc(100);
 405         if (ie == NULL)
 406                 return NULL;
 407
 408         wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 409         len = wpabuf_put(ie, 1);
 410         wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 411
 412         if (wps_build_version(ie) ||
 413             wps_build_req_type(ie, req_type) ||
 414             wps_build_wfa_ext(ie, 0, NULL, 0)) {
 415                 wpabuf_free(ie);
 416                 return NULL;
 417         }
 418
 419         *len = wpabuf_len(ie) - 2;
 420
 421         return ie;
 422 }
 423
 424
 425 /**
 426  * wps_build_assoc_resp_ie - Build WPS IE for (Re)Association Response
 427  * Returns: WPS IE or %NULL on failure
 428  *
 429  * The caller is responsible for freeing the buffer.
 430  */
 431 struct wpabuf * wps_build_assoc_resp_ie(void)
 432 {
 433         struct wpabuf *ie;
 434         u8 *len;
 435
 436         wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
 437                    "Response");
 438         ie = wpabuf_alloc(100);
 439         if (ie == NULL)
 440                 return NULL;
 441
 442         wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 443         len = wpabuf_put(ie, 1);
 444         wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 445
 446         if (wps_build_version(ie) ||
 447             wps_build_resp_type(ie, WPS_RESP_AP) ||
 448             wps_build_wfa_ext(ie, 0, NULL, 0)) {
 449                 wpabuf_free(ie);
 450                 return NULL;
 451         }
 452
 453         *len = wpabuf_len(ie) - 2;
 454
 455         return ie;
 456 }
 457
 458
 459 /**
 460  * wps_build_probe_req_ie - Build WPS IE for Probe Request
 461  * @pw_id: Password ID (DEV_PW_PUSHBUTTON for active PBC and DEV_PW_DEFAULT for
 462  * most other use cases)
 463  * @dev: Device attributes
 464  * @uuid: Own UUID
 465  * @req_type: Value for Request Type attribute
 466  * @num_req_dev_types: Number of requested device types
 467  * @req_dev_types: Requested device types (8 * num_req_dev_types octets) or
 468  *      %NULL if none
 469  * Returns: WPS IE or %NULL on failure
 470  *
 471  * The caller is responsible for freeing the buffer.
 472  */
 473 struct wpabuf * wps_build_probe_req_ie(u16 pw_id, struct wps_device_data *dev,
 474                                        const u8 *uuid,
 475                                        enum wps_request_type req_type,
 476                                        unsigned int num_req_dev_types,
 477                                        const u8 *req_dev_types)
 478 {
 479         struct wpabuf *ie;
 480
 481         wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for Probe Request");
 482
 483         ie = wpabuf_alloc(500);
 484         if (ie == NULL)
 485                 return NULL;
 486
 487         if (wps_build_version(ie) ||
 488             wps_build_req_type(ie, req_type) ||
 489             wps_build_config_methods(ie, dev->config_methods) ||
 490             wps_build_uuid_e(ie, uuid) ||
 491             wps_build_primary_dev_type(dev, ie) ||
 492             wps_build_rf_bands(dev, ie) ||
 493             wps_build_assoc_state(NULL, ie) ||
 494             wps_build_config_error(ie, WPS_CFG_NO_ERROR) ||
 495             wps_build_dev_password_id(ie, pw_id) ||
 496 #ifdef CONFIG_WPS2
 497             wps_build_manufacturer(dev, ie) ||
 498             wps_build_model_name(dev, ie) ||
 499             wps_build_model_number(dev, ie) ||
 500             wps_build_dev_name(dev, ie) ||
 501             wps_build_wfa_ext(ie, req_type == WPS_REQ_ENROLLEE, NULL, 0) ||
 502 #endif /* CONFIG_WPS2 */
 503             wps_build_req_dev_type(dev, ie, num_req_dev_types, req_dev_types)
 504             ||
 505             wps_build_secondary_dev_type(dev, ie)
 506                 ) {
 507                 wpabuf_free(ie);
 508                 return NULL;
 509         }
 510
 511 #ifndef CONFIG_WPS2
 512         if (dev->p2p && wps_build_dev_name(dev, ie)) {
 513                 wpabuf_free(ie);
 514                 return NULL;
 515         }
 516 #endif /* CONFIG_WPS2 */
 517
 518         return wps_ie_encapsulate(ie);
 519 }
 520
 521
 522 void wps_free_pending_msgs(struct upnp_pending_message *msgs)
 523 {
 524         struct upnp_pending_message *p, *prev;
 525         p = msgs;
 526         while (p) {
 527                 prev = p;
 528                 p = p->next;
 529                 wpabuf_free(prev->msg);
 530                 os_free(prev);
 531         }
 532 }
 533
 534
 535 int wps_attr_text(struct wpabuf *data, char *buf, char *end)
 536 {
 537         struct wps_parse_attr attr;
 538         char *pos = buf;
 539         int ret;
 540
 541         if (wps_parse_msg(data, &attr) < 0)
 542                 return -1;
 543
 544         if (attr.wps_state) {
 545                 if (*attr.wps_state == WPS_STATE_NOT_CONFIGURED)
 546                         ret = os_snprintf(pos, end - pos,
 547                                           "wps_state=unconfigured\n");
 548                 else if (*attr.wps_state == WPS_STATE_CONFIGURED)
 549                         ret = os_snprintf(pos, end - pos,
 550                                           "wps_state=configured\n");
 551                 else
 552                         ret = 0;
 553                 if (ret < 0 || ret >= end - pos)
 554                         return pos - buf;
 555                 pos += ret;
 556         }
 557
 558         if (attr.ap_setup_locked && *attr.ap_setup_locked) {
 559                 ret = os_snprintf(pos, end - pos,
 560                                   "wps_ap_setup_locked=1\n");
 561                 if (ret < 0 || ret >= end - pos)
 562                         return pos - buf;
 563                 pos += ret;
 564         }
 565
 566         if (attr.selected_registrar && *attr.selected_registrar) {
 567                 ret = os_snprintf(pos, end - pos,
 568                                   "wps_selected_registrar=1\n");
 569                 if (ret < 0 || ret >= end - pos)
 570                         return pos - buf;
 571                 pos += ret;
 572         }
 573
 574         if (attr.dev_password_id) {
 575                 ret = os_snprintf(pos, end - pos,
 576                                   "wps_device_password_id=%u\n",
 577                                   WPA_GET_BE16(attr.dev_password_id));
 578                 if (ret < 0 || ret >= end - pos)
 579                         return pos - buf;
 580                 pos += ret;
 581         }
 582
 583         if (attr.sel_reg_config_methods) {
 584                 ret = os_snprintf(pos, end - pos,
 585                                   "wps_selected_registrar_config_methods="
 586                                   "0x%04x\n",
 587                                   WPA_GET_BE16(attr.sel_reg_config_methods));
 588                 if (ret < 0 || ret >= end - pos)
 589                         return pos - buf;
 590                 pos += ret;
 591         }
 592
 593         if (attr.primary_dev_type) {
 594                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 595                 ret = os_snprintf(pos, end - pos,
 596                                   "wps_primary_device_type=%s\n",
 597                                   wps_dev_type_bin2str(attr.primary_dev_type,
 598                                                        devtype,
 599                                                        sizeof(devtype)));
 600                 if (ret < 0 || ret >= end - pos)
 601                         return pos - buf;
 602                 pos += ret;
 603         }
 604
 605         if (attr.dev_name) {
 606                 char *str = os_malloc(attr.dev_name_len + 1);
 607                 size_t i;
 608                 if (str == NULL)
 609                         return pos - buf;
 610                 for (i = 0; i < attr.dev_name_len; i++) {
 611                         if (attr.dev_name[i] < 32)
 612                                 str[i] = '_';
 613                         else
 614                                 str[i] = attr.dev_name[i];
 615                 }
 616                 str[i] = '\0';
 617                 ret = os_snprintf(pos, end - pos, "wps_device_name=%s\n", str);
 618                 os_free(str);
 619                 if (ret < 0 || ret >= end - pos)
 620                         return pos - buf;
 621                 pos += ret;
 622         }
 623
 624         if (attr.config_methods) {
 625                 ret = os_snprintf(pos, end - pos,
 626                                   "wps_config_methods=0x%04x\n",
 627                                   WPA_GET_BE16(attr.config_methods));
 628                 if (ret < 0 || ret >= end - pos)
 629                         return pos - buf;
 630                 pos += ret;
 631         }
 632
 633         return pos - buf;
 634 }